Anomalous behaviours of terahertz reflected waves transmitted from GaAs induced by optical pumping

doi:10.1088/1674-1056/18/12/065

Abstract

Abstract Femtosecond pump-terahertz probe studies of carrier dynamics in semi-insulating GaAs have been investigated in detail for various pump powers. It is observed that, at high pump powers, the reflection peaks flip to the opposite polarity and dramatically enhance as the pump arrival time approaches the reflected wave of the terahertz pulse. The abnormal polarity-flip and enhancement can be interpreted by the pump-induced enhancement in the photoconductivity of GaAs and half-wave loss. Moreover, the carrier relaxation processes and surface states filling in GaAs are also studied in these measurements.

Keywords: terahertz carrier dynamics reflected wave

Received: 10 July 2009
Revised: 26 August 2009
Accepted manuscript online:

PACS:	78.70.Gq	(Microwave and radio-frequency interactions)
	72.20.Fr	(Low-field transport and mobility; piezoresistance)
	72.40.+w	(Photoconduction and photovoltaic effects)
	72.80.Ey	(III-V and II-VI semiconductors)
	73.20.At	(Surface states, band structure, electron density of states)

Fund: Project supported by the National Basic Research Program of China (973 Program) (Grant Nos 2007CB310408 and 2006CB302901), the National Natural Science Foundation of China (Grant No 10804077), Science Foundation of Beijing Municipal Commission of Educatio

Cite this article:

Shi Yu-Lei(施宇蕾),Zhou Qing-Li(周庆莉), Zhao Dong-Mei(赵冬梅), and Zhang Cun-Lin(张存林) Anomalous behaviours of terahertz reflected waves transmitted from GaAs induced by optical pumping 2009 Chin. Phys. B 18 5518

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Anomalous behaviours of terahertz reflected waves transmitted from GaAs induced by optical pumping

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